Some external emails cannot be opened (Exchange 2003)
Posted on 2007-09-30
After an Windows Upgrade on my Server 2003sp1/Exchange 2003sp2 I cannot open certain emails anymore. In the preview pane they come up as "this item contains active content that cannot be displayed in the preview pane". When I try to open it, I get "Can't open this item. Could not complete the operation. One or more parameter values are not valid."
I tried uninstalling all the installed updates, but no effect. I tried disabling the virus scanner (F-Secure), still no effect. Confirmed that the MSExchangeIS\VirusScan\Enable value is 0. Uninstalled the virus scanner completely. Still no effect. I did a "isinteg -fix -test alltests". It found some warnings, but the problem is still there.
To troubleshoot further, I created a new Storage Group with a new Mail Store and move one account to it. I can see the emails now, but the "From:" field is empty. When I press reply, the email address does show up. If I move the account back to the default Store, the emails are again impossible to open.
All the emails that are affected are from the outside (internet). They all have only an email address in the Internet header "From:" field ([From: email@example.com]). Emails that have [From: "sender" <firstname.lastname@example.org>] can be opened without a problem. Intelligent Message Filtering is turned off on the Default SMTP Virtual Server.
Does anyone have any idea what might be going on?